John Ive had the occasional TNT 'poof' 50-60- yards from the barrel during a hot PD shoot in summer. It happens so infrequently I am inclined to blame it on hitting a bug ( literally) on its way to the PD...

Ive had it happen with other bullets as well, soooo...

"...the left considers you vermin, and they'll kill you given the chance..." Bristoe